An exit area regulating ring static and fatigue test device

Abstract

The application belongs to the field of aero-engines, and particularly relates to an outlet area adjusting ring static force and fatigue test device; the application discloses an outlet area adjusting ring (A9 ring) static force and fatigue test device, and proposes a corresponding test loading method; the test device can simulate the boundary conditions of the outlet area adjusting ring (A9 ring), can be suitable for different types of tests (static force and fatigue) and tests of different types of outlet area adjusting rings (A9 rings), has strong universality, reduces test cost, and improves test efficiency.

Description

Technical Field

[0001] The present application belongs to the field of aero-engines, and in particular relates to a static and fatigue testing device for an outlet area adjustment ring. Background Art

[0002] With the rapid development of fourth-generation fighter jets in recent years, aircraft have placed increasingly higher demands on the performance of aircraft engines. The emergence of vectored nozzle technology in aircraft engines has greatly enhanced the flight capabilities of advanced fighter jets in post-stall maneuvers and short takeoff and landing. Aircraft engines using vectored thrust have the following advantages:

[0003] 1) Shorten the takeoff and landing run distance;

[0004] 2) It has a high instantaneous turning rate at all flight altitudes, and is highly maneuverable and agile;

[0005] 3) It can reduce the area and drag of the control surface;

[0006] 4) Improve the recoverability of engine flameout in low-speed and supersonic regions, as well as improve the recoverability of vortex stall.

[0007] 5) Less trim drag and relaxed design restrictions on supersonic wings.

[0008] Foreign countries started research in the field of vector nozzle technology earlier. Currently, the United States and Russia have mastered the core key technologies in this field. In addition, Germany, the United Kingdom, Spain, France, Israel, Sweden and other countries have also made important progress in some areas. Vector nozzles can be mainly divided into mechanical, pneumatic jet, plasma jet and synthetic jet according to their working principles. Mechanical vector nozzles are currently more widely used in engineering. Mechanical vector nozzle control technology (TVC-Technical of Vector-nozzle Control) can be further divided into four types: (1) two-dimensional convergence diffusion vector nozzle control technology (2DCD-2Dimensional Convergence Diffusion); (2) pitch axisymmetric vector nozzle control technology; (3) spherical convergence adjustment plate vector nozzle control technology (SCFN); (4) axisymmetric vector nozzle control technology (Axial-Symmetric Vectoring Exhaust Nozzle, AVEN). Among them, two-dimensional vector nozzle and axisymmetric vector nozzle control technology are now more popular, and many countries are conducting research.

[0009] The AVEN vector nozzle is a mainstream aircraft engine thrust vector control mechanism. A typical AVEN device mainly includes: casing, servo actuator, throat area adjustment ring (A8 ring), outlet area adjustment ring (A9 ring), connecting rod, convergence adjustment plate, expansion adjustment plate, convergence section sealing plate, expansion section sealing plate, outer fairing and other components, such as Figure 4 As shown, the A8 ring drives the convergent adjustment plate to control the engine nozzle throat area; the A9 ring and the A8 ring jointly drive the divergent adjustment plate to control the vector nozzle outlet area and the vector deflection angle.

[0010] A8 Ring Adjustment Principle: The engine throat area is adjusted using the A8 ring. The A8 ring provides axial output only and does not rotate, thus synchronizing the servo actuator's movement. The A8 area adjustment principle: The A8 servo actuator's synchronous displacement output drives the A8 ring along the engine's axial direction. The ring's rollers move along the cam surfaces of the convergence adjustment plate, driving the convergence adjustment plate to rotate about its axis of connection to the casing, thereby expanding or contracting the A8 area. High aerodynamic pressure at the engine throat allows the center of the A8 ring to automatically balance on the engine axis under the influence of aerodynamic forces.

[0011] A9 ring adjustment principle: The A9 ring has three actual degrees of freedom: translation along the engine axis and two rotations relative to the engine axis. A9 ring adjustment involves adjusting the A9 outlet area and vector deflection angle. A9 area adjustment principle: The A9 servo actuator synchronously outputs displacement along the engine axis. The RSRR-RRR spatial kinematic chain between the A9 ring, A8 ring, and casing regulates the expansion and contraction of the expansion blades to achieve A9 area control. A9 vector deflection principle: When the displacement outputs of the A9 ring-driven servo actuator are unequal, the A9 ring normal forms a deflection angle relative to the engine axis. This tangential deflection of the A9 ring relative to the engine axis occurs via the R-pair connecting rod, driving a tangential deflection of the expansion blades and causing the A9 vector deflection.

[0012] A search of existing literature and public data revealed that there are several patents for throat area adjustment ring (A8 ring) test devices, such as "A Throat Area Adjustment Ring Fatigue Life Test Device" (Publication No.: CN210123341U) and "A Vector Nozzle Ring Strength Tester" (Publication No.: CN204556245U). However, no relevant literature or data regarding the outlet area adjustment ring (A9 ring) test device and loading method were found. Summary of the Invention

[0013] In order to solve the above problems, the present application provides an outlet area adjustment ring static and fatigue test device, which is characterized by:

[0014] A9 ring;

[0015] The lower end of the A9 ring is connected to a plurality of axial displacement adjustment components by a circumferential ball joint, and the lower end of the axial displacement adjustment component is connected to the base platform;

[0016] The upper end circumferential ball joint of the A9 ring has multiple tie rod load measurement assemblies, and the upper end of each tie rod load measurement assembly is hinged to a radial displacement adjustment assembly, which is fixed to the top plate and is used to radially move the upper end of the tie rod load measurement assembly;

[0017] The top plate is fixed to the base platform through the bearing columns; the axial displacement adjustment component, the tie rod load loading measurement component and the radial displacement adjustment component are all equipped with displacement sensors, and the tie rod load loading measurement component has a force sensor.

[0018] The spherical joint is a spatial connection hinge that can prevent the A9 ring from being restricted when deflected. It consists of two parts, a ball and a spherical shell. The hinge only allows the two parts to rotate relative to each other around the common center of the sphere, restricting their relative movement in three directions. The engineering background of the spherical joint is ball bearings, fixed spherical joint supports, etc. The constraint force of the support on the ball component passes through the center of the sphere, and the undetermined constraint force can be replaced by three mutually perpendicular components. The constraint that fixes the non-free body to its constrained object is called a fixed end constraint. Common ones include walls facing cantilever beams, ground facing large dams, etc. The fixed end constraint prevents the non-free body from moving or rotating in any direction. Among them, the axial displacement adjustment component and the radial displacement adjustment component adjust the angle between the axis of the pull rod load loading measurement component and the A9 ring by adjusting the axial and radial positions. Specifically, the axial displacement adjustment component and the radial displacement adjustment component are both equipped with displacement sensors, and the displacement sensing component is connected to a control system. The control system analyzes the angle between the axis of the pull rod load loading measurement component and the axis of the A9 ring based on the information of the displacement sensing component, and applies load through the pull rod load loading measurement component to apply load to the A9 ring at various angles.

[0019] Preferably, the radial displacement adjustment assembly includes a servo actuator connected to the top plate and a single-ear seat installed on the actuator shaft of the servo actuator, one side of the single-ear seat has a single ear hinged to the pull rod load loading measurement assembly, and the other side has a through hole, the through hole is connected to the linear guide rod fixed to the top plate, so that the single-ear seat moves axially along the linear guide rod, and the linear guide rod bears the load of the single-ear seat in multiple directions.

[0020] Preferably, a linear motion bearing is installed in the through hole to reduce the friction between the through hole and the linear guide rod. The linear bearing is a linear motion system used in conjunction with a cylindrical shaft for linear travel. Since the load-bearing ball is in point contact with the bearing outer shell, the steel ball rolls with minimal friction resistance. Therefore, the linear bearing has low friction and is relatively stable. It does not change with the bearing speed and can obtain smooth linear motion with high sensitivity and high precision. The consumption of linear bearings also has its limitations. The most important one is that the bearing has poor impact load capacity and poor load-bearing capacity. Secondly, the linear bearing vibrates and makes large noises when moving at high speeds. The automatic selection of linear bearings is included. Linear bearings are widely used in sliding parts of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery. Since the load-bearing ball is in point contact with the bearing, the load used is small. The steel ball rotates with extremely small friction resistance, thereby obtaining smooth motion with high precision.

[0021] Preferably, when the stroke of the radial displacement adjustment assembly is 0, the axis of the pull rod load loading measurement assembly is parallel to the axis of the A9 ring.

[0022] Preferably, when the stroke of the radial displacement adjustment assembly is not 0, the pull rod load loading measurement assembly is tilted toward the axis of the A9 ring.

[0023] Preferably, the lower end of the A9 ring has three circumferential ball joints with axial displacement adjustment components, and the three axial displacement adjustment components are evenly arranged circumferentially. The three axial displacement adjustment components are arranged circumferentially, and each displacement adjustment component has a different actuating stroke, so that the A9 ring can be deflected.

[0024] Preferably, the upper circumferential ball joint of the A9 ring has three tie rod load measuring assemblies.

[0025] Preferably, each axial displacement adjustment component, each tie rod load loading measurement component and each radial displacement adjustment component adopts a single-channel single-control mode, that is, each axial displacement adjustment component, each tie rod load loading measurement component and each radial displacement adjustment component are controlled separately, and each axial displacement adjustment component, each tie rod load loading measurement component and each radial displacement adjustment component can be actuated separately.

[0026] Preferably, each axial displacement adjustment component, each tie rod load loading measurement component and each radial displacement adjustment component, as well as the displacement sensor of each axial displacement adjustment component, the displacement sensor of each tie rod load loading measurement component and the displacement sensor of each radial displacement adjustment component are all connected to a terminal, that is, each axial displacement adjustment component, each tie rod load loading measurement component and each radial displacement adjustment component and the measuring device they have are all controlled by a terminal, so that they can pass.

[0027] Advantages of this application include:

[0028] 1) A test device for outlet area adjustment rings was designed. The test device combines an axial displacement adjustment component, a radial displacement adjustment component, and a tie rod load measurement component. Utilizing a closed-loop control system, it can dynamically simulate different tie rod loads during outlet area changes and vector deflection.

[0029] 2) A test loading method for the outlet area adjustment ring is proposed. The axial displacement adjustment assembly and the radial displacement adjustment assembly are adjusted through axial and radial position adjustment, thereby adjusting the angle between the axis of the pull rod load loading measurement assembly and the A9 ring. When the load is applied through the pull rod load loading measurement assembly, the load is applied to the A9 ring at various angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the static and fatigue test device for the outlet area adjustment ring;

[0031] Figure 2 Schematic diagram of the axial displacement adjustment assembly;

[0032] Figure 3 Schematic diagram of radial displacement adjustment assembly;

[0033] Figure 4 Background knowledge Schematic diagram of the working principle of A8 and A9 rings;

[0034] Among them, 1-basic platform; 2-bottom plate; 3-axial displacement adjustment assembly; 4-A9 ring; 5-bearing column; 6-pull rod load loading and measuring assembly; 7-radial displacement adjustment assembly; 8-top plate; 31-single ear body (excluding joint ball); 32-servo actuator; 33-displacement sensor; 34-single ear body (including joint ball); 71-single ear seat; 72-displacement sensor; 73-linear motion bearing; 74-servo actuator; 75-linear guide rod; 76-single ear body (including joint ball); 77-positioning block. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0036] This application provides a static and fatigue test device for an outlet area adjustment ring.

[0037] A9 ring 4;

[0038] The lower end of the A9 ring 4 is connected to a plurality of axial displacement adjustment components 3 by a circumferential ball joint, and the lower end of the axial displacement adjustment component 3 is connected to the base platform 1;

[0039] The upper end of the A9 ring 4 is provided with a plurality of tie rod load measuring assemblies 6 on a circumferential ball joint. The upper end of each tie rod load measuring assembly 6 is hingedly connected to a radial displacement adjustment assembly 7. The radial displacement adjustment assembly 7 is fixed to a top plate 8. The radial displacement adjustment assembly 7 is used to radially move the upper end of the tie rod load measuring assembly 6.

[0040] The top plate 8 is fixed to the base platform 1 through the supporting column 5; the axial displacement adjustment component 3, the pull rod load loading measurement component 6 and the radial displacement adjustment component 7 are all equipped with displacement sensors, and the pull rod load loading measurement component 6 has a force sensor.

[0041] The ball joint is a spatial connection joint that can prevent the A9 ring 4 from being restricted when deflected. It consists of two parts, a ball and a spherical shell. The joint only allows the two parts to rotate relative to each other around the common center of the ball, limiting their relative movement in three directions. The engineering background of the ball joint is ball bearings, fixed ball joint supports, etc. The restraining force of the support on the ball component passes through the center of the ball, and the undetermined restraining force can be replaced by three mutually perpendicular components. The constraint that fixes the non-free body to its constrained object is called a fixed end constraint. Common examples include walls facing cantilever beams, ground facing large dams, etc. The fixed end constraint prevents the non-free body from moving or rotating in any direction. Among them, the axial displacement adjustment component 3 and the radial displacement adjustment component 7 adjust the angle between the axis of the pull rod load loading measurement component 6 and the A9 ring 4 by adjusting the axial and radial positions. When the load is applied through the pull rod load loading measurement component 6, the load is applied to the A9 ring 4 at various angles.

[0042] In some optional embodiments, the radial displacement adjustment assembly 7 includes a servo actuator 74 connected to the top plate 8 and a single-ear seat 71 installed on the actuator shaft of the servo actuator 74. The single-ear seat 71 has a single ear hinged to the pull rod load loading measurement assembly 6 on one side, and a through hole on the other side. The through hole is connected to a linear guide rod 75 fixed to the top plate 8, so that the single-ear seat 71 moves axially along the linear guide rod 75, and the linear guide rod 75 bears loads in multiple directions of the single-ear seat 71.

[0043] In some optional embodiments, a linear motion bearing 73 is installed in the through hole to reduce the friction between the through hole and the linear guide rod 75. The linear bearing is a linear motion system used in conjunction with a cylindrical shaft for linear travel. Since the load-bearing ball is in point contact with the bearing outer shell, the steel ball rolls with minimal friction resistance. Therefore, the linear bearing has low friction and is relatively stable. It does not change with the bearing speed and can obtain smooth linear motion with high sensitivity and high precision. The consumption of linear bearings also has its limitations. The most important one is that the bearing has poor impact load capacity and load-bearing capacity. Secondly, the linear bearing vibrates and makes large noises when moving at high speeds. The automatic selection of linear bearings is included. Linear bearings are widely used in sliding parts of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery. Since the load-bearing ball is in point contact with the bearing, the load is small. The steel ball rotates with extremely small friction resistance, thereby obtaining smooth motion with high precision.

[0044] In some optional embodiments, when the stroke of the radial displacement adjustment assembly 7 is 0, the axis of the pull rod load loading measurement assembly 6 is parallel to the axis of the A9 ring 4 .

[0045] In some optional embodiments, when the stroke of the radial displacement adjustment assembly 7 is not 0, the pull rod load loading measurement assembly 6 is tilted toward the axis of the A9 ring 4 .

[0046] In some optional embodiments, the lower end of the A9 ring 4 has three circumferential ball joints with axial displacement adjustment components 3, and the three axial displacement adjustment components 3 are evenly arranged circumferentially. The three axial displacement adjustment components 3 are arranged circumferentially, and each displacement adjustment component 3 has a different actuating stroke, which can achieve deflection of the A9 ring 4.

[0047] In some optional embodiments, the upper end circumferential ball joint of the A9 ring 4 has three tie rod load measurement components 6 .

[0048] In some optional embodiments, each axial displacement adjustment component 3, each tie rod load loading measurement component 6 and each radial displacement adjustment component 7 adopts a single-channel single-control mode, that is, each axial displacement adjustment component 3, each tie rod load loading measurement component 6 and each radial displacement adjustment component 7 are controlled separately, and each axial displacement adjustment component 3, each tie rod load loading measurement component 6 and each radial displacement adjustment component 7 can be actuated separately.

[0049] In some optional embodiments, each axial displacement adjustment component 3, each tie rod load loading measurement component 6 and each radial displacement adjustment component 7, as well as the displacement sensor of each axial displacement adjustment component 3, the displacement sensor of each tie rod load loading measurement component 6 and the displacement sensor of each radial displacement adjustment component 7 are all connected to a terminal, that is, each axial displacement adjustment component 3, each tie rod load loading measurement component 6 and each radial displacement adjustment component 7 and the measuring devices they have are all controlled by a terminal, so that they can pass.

[0050] One specific embodiment is that the bottom plate 2 is fixed on the base platform 1 through a threaded connection, and the ball head seat of the outlet area adjustment ring A9 ring 4 is connected to the axial displacement adjustment component 3 through a pin. Figure 4 The single ear body with joint ball 34 is connected, and the single ear body without joint ball 31 in the axial displacement adjustment component 3 is fixed to the base plate 2 through a threaded connection; the lower end of the pull rod load loading measurement component 6 is connected to the pull rod of the outlet area adjustment ring A9 ring 4 through a double ear seat through a pin, and the upper end of the pull rod load loading measurement component 6 is connected to the single ear seat 71 in the radial displacement adjustment component 7 through a pin, and the positioning block 77 and the single ear body with joint ball 76 in the radial displacement adjustment component 7 are connected to the top plate 8 through threads, and the top plate 8 is connected to the bearing column 5 through threads, and the bearing column 5 is fixed to the base platform 1 through threads. Note: The linear motion bearing 73 and the linear guide rod 75 in the radial displacement adjustment component 7 can also be in the form of a linear guide rail, changing the point contact to surface contact, so as to improve the load-bearing capacity of the radial displacement adjustment component 7.

[0051] The tie rod load is applied by the tie rod load measurement assembly 6, with the load magnitude fed back by the force sensor within this assembly. The radial displacement adjustment assembly 7 and the axial displacement adjustment assembly 3 can be used to vary the angle between the tie rod load measurement assembly 6 and the axis of the outlet area adjustment ring A9 4. Displacement values ​​are fed back by displacement sensors 72 and 33 within these assemblies. Equation 1 calculates the angle θ between the tie rod load and the axis of the outlet area adjustment ring A9. Simultaneously controlling the load output of different tie rod load measurement assemblies 6 allows simulation of varying tie rod loads associated with outlet area changes and vector deflection. All load measurement and displacement adjustment assemblies utilize a single-channel, single-control mode.

[0052] The servo actuator, force displacement sensor and servo controller form a load displacement closed-loop control system to achieve follow-up adjustment of load displacement.

[0053] The calculation method for the angle between the tie rod load and the axis of the outlet area adjustment ring A9 is:

[0054]

[0055] Where:

[0056] θ——the angle between the tie rod load and the axis of the outlet area adjustment ring A9;

[0057] R - radial distance between the lower end action point of the pull rod load measurement assembly and the axis of the outlet area adjustment ring A9, mm;

[0058] r——The radial distance between the upper end action point of the pull rod load measurement assembly and the axis of the outlet area adjustment ring A9, mm;

[0059] L is the axial distance between the upper and lower action points of the pull rod load measurement assembly along the axis of the outlet area adjustment ring A9, mm.

[0060] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A static and fatigue test device for an outlet area adjustment ring, characterized by: Outlet area adjustment ring (4); The lower end of the outlet area adjustment ring (4) is circumferentially spherically hinged with a plurality of axial displacement adjustment components (3), and the lower end of the axial displacement adjustment component (3) is connected to the base platform (1); The upper end circumferential ball joint of the outlet area adjustment ring (4) has a plurality of tie rod load loading measurement assemblies (6), the upper end of each tie rod load loading measurement assembly (6) is hinged to a radial displacement adjustment assembly (7), the radial displacement adjustment assembly (7) is fixed to the top plate (8), and the radial displacement adjustment assembly (7) has an actuator for radially moving the upper end of the tie rod load loading measurement assembly (6); The top plate (8) is fixed to the base platform (1) via a bearing column (5); the axial displacement adjustment component (3) has an actuator for axially displacing the outlet area adjustment ring (4); the pull rod load loading measurement component (6) has an actuator for loading the outlet area adjustment ring (4) and a force sensor for measuring the loading force; The radial displacement adjustment assembly (7) includes a servo actuator (74) connected to the top plate (8) and a single-ear seat (71) mounted on the actuating shaft of the servo actuator (74), one side of the single-ear seat (71) has a single ear hinged to the pull rod load loading measurement assembly (6), and the other side has a through hole, the through hole is connected to the linear guide rod (75) fixed to the top plate (8), so that the single-ear seat (71) moves axially along the linear guide rod (75), and the linear guide rod (75) carries the load of the single-ear seat (71) in multiple directions; The tie rod load is applied by the tie rod load loading and measuring assembly (6), and the load magnitude is fed back by the force sensor in the tie rod load loading and measuring assembly (6). The radial displacement adjustment assembly (7) and the axial displacement adjustment assembly (3) can be used to change the angle between the tie rod load loading and measuring assembly (6) and the axis of the outlet area adjustment ring (4). The displacement value is fed back by the displacement sensors (72) and (33) in the assembly. The angle θ between the tie rod load and the axis of the outlet area adjustment ring (4) is calculated using a formula, and the load outputs of different tie rod load loading and measuring assemblies (6) are controlled respectively to simulate different tie rod loads when the outlet area changes and the vector deflection occur. The servo actuator (74), the displacement sensor (72) and the servo controller form a load-displacement closed-loop control system to achieve follow-up adjustment of the load displacement.

2. The static and fatigue testing device for the outlet area adjustment ring according to claim 1, characterized in that: A linear motion bearing (73) is installed in the through hole to reduce friction between the through hole and the linear guide rod (75).

3. The static and fatigue testing device for the outlet area adjustment ring according to claim 1, characterized in that: When the stroke of the radial displacement adjustment component (7) is 0, the axis of the pull rod load loading measurement component (6) is parallel to the axis of the outlet area adjustment ring (4).

4. The static and fatigue testing device for the outlet area adjustment ring according to claim 3, characterized in that: When the stroke of the radial displacement adjustment component (7) is not zero, the pull rod load loading measurement component (6) tilts toward the axis of the outlet area adjustment ring (4).

5. The static and fatigue testing device for the outlet area adjustment ring according to claim 1, characterized in that: The lower end of the outlet area adjustment ring (4) is circumferentially spherically hinged with three axial displacement adjustment components (3), and the three axial displacement adjustment components (3) are evenly arranged circumferentially.

6. The static and fatigue testing device for the outlet area adjustment ring according to claim 1, characterized in that: The upper end circumferential ball joint of the outlet area adjustment ring (4) has three tie rod load measuring components (6).

7. The static and fatigue testing device for the outlet area adjustment ring according to claim 1, characterized in that: The axial displacement adjustment component (3) and the radial displacement adjustment component (7) are both equipped with displacement sensors, and the displacement sensing components are connected to a control system. The control system analyzes the angle between the axis of the pull rod load loading measurement component (6) and the axis of the outlet area adjustment ring (4) based on information from the displacement sensing components.

8. The static and fatigue testing device for the outlet area adjustment ring according to claim 1, characterized in that: Each axial displacement adjustment assembly (3) is independently actuated.

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